There's public code to parse and extract attachments from tnef.  Or just
the file names themselves.

Ie https://pypi.org/project/tnefparse/

Brandon

On Thu, Nov 14, 2019, 4:41 AM Stefan Bauer via mailop <[email protected]>
wrote:

> Hi,
>
>
> we run some antispam-mailservers with ~ 10.000 mails / day for our
> customers.
>
>
> Due to emotet and stuff, we started blocking some file extensions with
> great success. Sometimes "bad" attachment slip through as they are encoded
> by TNEF.
>
> Our spamfilter is not able to de-code it. Not even some of our Mailcliens
> can read the attachments at the end.
>
>
> How do you treat "TNEF-mails" in your environment?
>
>
> blocking doesnt sound right but sometimes i feel lilke i should just to
> show that proprietary stuff is bad.
>
>
> Thank you.
>
>
> Stefan.
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